Flora of the Marquesas
Dicotyledon Literature for Bidens henryi
Wagner et al., 2013; Lorence & Wagner, 2020.
   Asteraceae -- The Sunflower Family Bibliography
      Bidens henryi Sherff
General Information

DistributionMarquesas Islands.In the Marquesas, endemic to Hiva Oa, Tahuata.
HabitatRidges and summit areas, in montane wet shrublands or low forests
Elevation(400-)620-1200 m
Habit
Erect subshrub or shrub, 1‒2 m tall.
Leaves
Leaves simple, 2.5‒13 cm long including petiole; blade lanceolate or elliptic-lanceolate, 1.8‒9.5 cm long, 0.5‒3.8 cm wide, glabrous, margin serrate, apex acuminate.
Flowers
Heads (1‒)3‒4(‒7), in diffuse cymes terminating main stem and lateral branches, 5‒15 mm in diameter excluding rays, peduncle 1.2‒9.5 cm long, glabrous; outer involucral bracts 4‒13 mm long, linear, well differentiated from inner bracts, recurved, apex erose, sometimes with few short hairs; ray florets ca. 13, sterile, rays yellow, 12‒15 mm long, 2‒5 mm wide; disk florets ca. 30‒32, perfect, corollas yellow; pappus of 2‒3 barbed awns.
Fruit
Achenes black, straight, 8‒10 mm long, 1‒2 mm wide, glabrous or with a few inconspicuous setae near the apex.
Contributor
Nancy Khan